#!/usr/bin/env python3
"""
Configuration file handler for QLPyCon
Supports loading from ~/.qlpycon.conf or ./qlpycon.conf
"""

import os
import configparser
import logging

logger = logging.getLogger('config_loader')


class ConfigLoader:
    """Load configuration from INI file"""

    def __init__(self):
        self.config = configparser.ConfigParser()
        self.config_loaded = False

    def load(self):
        """
        Try to load config from (in order):
        1. ./qlpycon.conf (current directory)
        2. ~/.qlpycon.conf (home directory)
        """
        config_paths = [
            'qlpycon.conf',
            os.path.expanduser('~/.qlpycon.conf')
        ]

        for path in config_paths:
            if os.path.exists(path):
                try:
                    self.config.read(path)
                    self.config_loaded = True
                    logger.info(f'Loaded configuration from: {path}')
                    return True
                except Exception as e:
                    logger.warning(f'Failed to load config from {path}: {e}')

        logger.debug('No configuration file found, using defaults')
        return False

    def get(self, section, key, fallback=None):
        """Get a configuration value"""
        if not self.config_loaded:
            return fallback

        try:
            return self.config.get(section, key, fallback=fallback)
        except (configparser.NoSectionError, configparser.NoOptionError):
            return fallback

    def get_int(self, section, key, fallback=0):
        """Get an integer configuration value"""
        value = self.get(section, key)
        if value is None:
            return fallback

        try:
            return int(value)
        except ValueError:
            logger.warning(f'Invalid integer value for [{section}] {key}: {value}')
            return fallback

    def get_bool(self, section, key, fallback=False):
        """Get a boolean configuration value"""
        value = self.get(section, key)
        if value is None:
            return fallback

        return value.lower() in ('true', 'yes', '1', 'on')

    def get_host(self):
        """Get connection host"""
        return self.get('connection', 'host')

    def get_password(self):
        """Get connection password (supports ${ENV_VAR} syntax)"""
        password = self.get('connection', 'password')
        if not password:
            return None

        return self._resolve_password(password)

    def get_servers(self):
        """Return dict of name -> host:port from [servers]"""
        if not self.config.has_section('servers'):
            return {}
        return dict(self.config.items('servers'))

    def get_server(self, name):
        """
        Resolve a named server to (host, password).
        host comes from [servers], password from [server:name] or [connection].
        Returns (host, password) or (None, None) if name not found.
        """
        servers = self.get_servers()
        if name not in servers:
            return None, None

        host = servers[name]
        if not host.startswith('tcp://'):
            host = f'tcp://{host}'

        # Per-server password override
        section = f'server:{name}'
        if self.config.has_section(section):
            password = self.config.get(section, 'password', fallback=None)
            if password:
                password = self._resolve_password(password)
        else:
            password = self.get_password()

        return host, password

    def _resolve_password(self, password):
        """Resolve a password string, expanding ${VAR:-default} if needed"""
        if not password:
            return None
        if password.startswith('${') and password.endswith('}'):
            inner = password[2:-1]
            if ':-' in inner:
                env_var, default = inner.split(':-', 1)
            else:
                env_var, default = inner, None
            return os.environ.get(env_var, default)
        return password

    def get_log_level(self):
        """Get logging level"""
        level_str = self.get('logging', 'level', 'INFO')
        levels = {
            'DEBUG': logging.DEBUG,
            'INFO': logging.INFO,
            'WARNING': logging.WARNING,
            'ERROR': logging.ERROR,
            'CRITICAL': logging.CRITICAL
        }
        return levels.get(level_str.upper(), logging.INFO)


def create_example_config():
    """Create an example configuration file"""
    config_content = """# qlpycon.conf
# Edit this file as needed.
#
# Connect by server name:  qlpycon ffa
# Connect directly:        qlpycon --host tcp://1.2.3.4:28960 --password secret
# List servers:            qlpycon --list

# === Connection defaults ===>
# Default host if no server name or --host is given
[connection]
host = tcp://127.0.0.1:28960

# Password for all servers unless overridden in [server:name]
# Use ${ENV_VAR} to read from environment variable (recommended)
# Or set directly (less secure):
password = ${QLPYCON_PASSWORD:-secret}

# === Named servers ===>
# Simple entries: name = host:port
# These use the password from [connection] above.
[servers]
# Example:
#ffa = 10.13.12.161:28960

# === Per-server overrides ===>
# Use [server:name] to override any setting for a specific server.
# The name must match an entry in [servers] above.
# Example:
#[server:ffa]
#password = ${FFA_PASSWORD:-secret}

# === Logging ===>
[logging]
# Log level: DEBUG, INFO, WARNING, ERROR, CRITICAL
level = WARNING

# === UI ===>
[ui]
# Number of commands to remember in history
max_history = 10

# === Behaviour ===>
[behavior]
# Seconds to confirm quit (press Ctrl-C twice within this window)
quit_timeout = 3.0
# Seconds before players respawn after death
respawn_delay = 3.0
"""

    example_path = os.path.expanduser('~/.qlpycon.conf.example')
    try:
        with open(example_path, 'w') as f:
            f.write(config_content)
        print(f'Created example config: {example_path}')
        print(f'Copy to ~/.qlpycon.conf and edit as needed')
        return True
    except Exception as e:
        print(f'Failed to create example config: {e}')
        return False


if __name__ == '__main__':
    # Create example config when run directly
    create_example_config()